Sikhism is a monotheistic faith founded more than 500 years ago in India. It has roughly 27 million followers worldwide, making it the fifth-largest religion. Observant Sikhs do not cut their hair; male followers often cover their heads with turbans - which are considered sacred - and refrain from shaving their beards. There are roughly 500,000 Sikhs in the U.S., according to estimates. The majority worldwide live in Punjab a northwestern state of India.